40Ar/39Ar constraints on the timing and origin of Miocene leucitite volcanism in southeastern Australia

B. E. Cohen*, K. M. Knesel, P. M. Vasconcelos, D. S. Thiede, J. M. Hergt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Laser incremental-heating 40Ar/39Ar geochronology of seven leucitites from southeastern Australia indicates that leucite-bearing lavas in individual geographic clusters were erupted in one million years or less. The eruption ages range from 17.9 ± 0.3 Ma (2σ) at El Capitan in northern-central New South Wales to 8.9 ± 0.2 Ma (2σ) at Cosgrove in northern Victoria. The 40Ar/39Ar results demonstrate that the southward migration of leucite-bearing lavas was near-contemporaneous with age-progressive central-volcano magmatism in southeastern Australia. As such, the 40Ar/39Ar results are consistent with a hotspot-related origin for the leucitites. However, the question of whether single or multiple hotspots are required to explain these volcanic chains, which are separated by a distance of about 300 km, awaits a more complete geochronological picture of the onset, duration and migration of leucitite and central-volcano magmatism in eastern Australia.

Original languageEnglish
Pages (from-to)407-418
Number of pages12
JournalAustralian journal of earth sciences
Volume55
Issue number3
DOIs
Publication statusPublished - 1 Jan 2008

Keywords

  • Argon-argon dating
  • Cenozoic
  • Geochronology
  • Hotspot
  • Intraplate volcanism
  • Leucitite

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